Ditto on that, I love a little DIY fun, and so far eveyone has come up with some pretty good ideas, with 3 pairs, I will be modding a lot, my one big mod will be putting a jack in the right cup and getting some balanced cables made, the only way to keep them balanced to the driver.

YEYimeh is right on the money...
Put a lil cotton in that empty chamber behind the driver, not too dense but nice and fluffy. ..
As for the pin hole instead of all off..
I rather have that driver hole full open so I can access her extreme bass.... ... lol!
It's alk "SF" fault I bought two.. haEdited by Maxx134 - 2/16/14 at 11:18am

First day usage they simply NOT Supposed to sound this dam good!
WTF is going on?
Maybe opening the port relaxes the driver?
This thing is a monster!

We have been trying to get the word out, but sadly one head-fier on a rage, get's a bad impression at a Best-Buy Kiosk and peeps loose interest, just on one persons word, that was so frustrating trying to out last that non-sense. But finally many fine folks like yourself, who apparently are not delusional either, are finding the Mikros 90 a superb headphone, that much belies it's current price. Every time I sit down to listen I get lost in the music, this morning I played all my P.O.D., and even though it is pretty compressed, they still are good sounding recordings. love hearing the mix of bass notes from different instruments inter-playing, without coloring each other, the transients and the way they can hang on to a shimmer of a cymbal allowing me to forget this is a recording and just enjoy. We have discussed it hear before, one place the ML's really shine is in decay, how a sound subtly fades away, normally the last standing wave of that sound will be absorbed by a wall or structure at on end of the recording venue, and this phenomenon I can clearly hear in cymbals on well recoded music you can hear them fade off to one channel.

There are some who feel the ML's do particular genres better than others, for me, I listen to almost every kind of music, and they all sound great... to me ! I can't imagine how a very faithful reproduction of what was recorded can be a downside for a transducer, the ML's have yet to show weakness or strain no matter what I throw at them, and no matter how loud, and my Ray Samuel s Predator has plenty of head room and never strains to drive all my headphones. The predator is almost euphoric in its tube like sound, but not loose and out of control like some tubes can be , just the nice warm feel of music, not transistors, which is why I think Ray is a genius at circuit design.. ( bowing on my knees to Mr.Samuels). Music should sound warm any ways, at least if you understand chemistry and physics, motion creates heat, so a transducer in a room will effect the air with micro changes in temperature as all the molecules collide and share energy and then melt into the wall as the dying echo of a hi hat... hehe , But of course to really change the temp in a room, tube amps help a lot.

I think you can do it doc! Just look at Maxx's photos. Just remove a few screws and then remove the felt disk, then presto! - you may have the bass you're looking for.

What if the felt disc is replaced with a piece of more permeable acoustic fabric/cloth? That's what I want to try. : ) Add the el cheapo Beats knock-off cable and my second pair become the "bass-heavy" Mikros 90 for R&R.

What if the felt disc is replaced with a piece of more permeable acoustic fabric/cloth? That's what I want to try. : ) Add the el cheapo Beats knock-off cable and my second pair become the "bass-heavy" Mikros 90 for R&R.

I've got 2 sets on the way - supposedly one set for me and one set for my wife. Once I confirm with my hearing that I do indeed like these, I will order another set (or 2), and do the bass mod on 1 set. Oh yeah.....a phone for all seasons and all genre's....